* {
    margin: 0 auto;
    padding: 0;
}

a {
    text-decoration: none;
}

/* 回到顶部 */

#db {
    width: 50px;
    height: 200px;
    /* background-color: skyblue; */
    position: fixed;
    right: 0;
    top: 38%;
    /* margin: 100px; */
    right: 10px;

}

#db a {
    display: block;
    width: 50px;
    height: 55px;
    position: relative;
    /* border-radius: 30%; */
    /* background-color: red; */
}

/* #db a:nth-child(4){
 display: none;
} */

#db a img {
    background: no-repeat;
    width: 50px;
    height: 50px;
    border: 2px solid skyblue;
    border-radius: 50%;

}

#db a .img-1 {
    background: url("../images/bg.png")no-repeat;
}

#db a .img-2 {
    background: url("../images/bg.png")no-repeat;
    background-position: 0px -50px;
}

#db a .img-3 {
    background: url("../images/bg.png")no-repeat;
    background-position: 0px -100px;

}

#db a .img-4 {
    background: url("../images/bg.png")no-repeat;
    background-position: 0px -150px;
}

.nn {
    display: none;
}

#db a span {
    border-radius: 20%;
    background-size: 100%;
    background: url("../images/src=http___bpic.588ku.com_back_pic_05_81_85_035c3c50f47905f.jpg&refer=http___bpic.588ku.jpg")no-repeat;
    width: 130px;
    height: 50px;
    background-color: khaki;
    position: absolute;
    top: 3px;
    right: 51px;
    text-align: center;
    line-height: 50px;
    display: none;
    font-size: 10px;
    font-weight: bold;
    font-style: initial;
}

